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New Way of Predicting Production State by Carbon Isotope Fractionation in the Fuling shale Gas Field,Southeast Sichuan Basin

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Acta Geologica Sinica(English Edition) 2019年第2期93卷 491-492页

作者： LUO Houyong LIU Wenhui FAN Ming TAO Cheng WANG Xiaofeng ZHANG Dongdong HAN Yuanhong State key laboratory of continental Dynamics/Department of Geology Northwest University State key laboratory of shale oil and Gas Enrichment Mechanisms and Effective Development key laboratory of Coal Resources Exploration and Comprehensive Utilization Ministry of Land and Resources

Objective With the discovery of the Fuling shale gas field and the realization of commercial exploitation, the prediction of shale gas well production state has attracted wide attention of scholars at home and abroad.

关键词： New Way Production Gas Field

Hydrophobic epoxy resin coated proppants with ultra-high self-suspension ability and enhanced liquid conductivity

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Petroleum Science 2021年第6期18卷 1753-1759页

作者： Fan Fan Feng-Xia Li Shou-Ceng Tian Mao Sheng Waleed Khan Ai-Ping Shi Yang Zhou Quan Xu State key laboratory of shale oil and Gas Enrichment Mechanisms and Effective Development National Energy Shale Oil Research and Development CenterHarvard SEAS-CUPB Joint Laboratory on Petroleum ScienceChina University of Petroleum(Beijing)Beijing102249China

Proppant is a key material for enhancing unconventional oil and gas production which requires a long distance of migration and efficient liquid conductivity paths within the hydraulic ***,it is difficult to find a proppant with both high self-suspension ability and liquid ***,a simple method is developed to coat epoxy resin onto the ceramic proppant and fabricate a novel coated proppant with high hydrophobicity,self-suspension,and liquid conductivity *** with uncoated ceramic proppants,the epoxy resin coated(ERC) proppant has a high self-suspension ability nearly 16 times that of the uncoated ***,the hydrophobic property and the liquid conductivity of the ERC proppant increased by 83.8% and 16.71%,respectively,compared with the uncoated *** summary,this novel ERC proppant provides new insights into the design of functional proppants,which are expected to be applied to oil and gas production.

关键词： Coated proppant Hydrophobic property Self-suspension Conductivity

Evaluating the stability and volumetric flowback rate of proppant packs in hydraulic fractures using the lattice Boltzmann-discrete element coupling method

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 2052-2063页

作者： Duo Wang Sanbai Li Rui Wang Binhui Li Zhejun Pan national key laboratory of continental shale oil Northeast Petroleum UniversityDaqing163318China Institute of Unconventional oil&Gas Northeast Petroleum UniversityDaqing163318China School of Environmental Science and Engineering Southern University of Science and TechnologyShenzhen518055China national Center for Applied Mathematics Shenzhen(NCAMS) Southern University of Science and TechnologyShenzhen518055China national key laboratory of continental shale oil Daqing Oilfield of CNPCDaqing163002China Daqing oilfield Exploration and Development Research Institute DaqingHeilongjiang163712China

The stability and mobility of proppant packs in hydraulic fractures during hydrocarbon production are numerically investigated by the lattice Boltzmann-discrete element coupling method(LB-DEM).This study starts with a preliminary proppant settling test,from which a solid volume fraction of 0.575 is calibrated for the proppant pack in the *** the established workflow to investigate proppant flowback,a displacement is applied to the fracture surfaces to compact the generated proppant pack as well as further mimicking proppant embedment under closure *** a pressure gradient is applied to drive the fluid-particle flow,a critical aperture-to-diameter ratio of 4 is observed,above which the proppant pack would *** results also show that the volumetric proppant flowback rate increases quadratically with the fracture aperture,while a linear variation between the particle flux and the pressure gradient is exhibited for a fixed fracture *** research outcome contributes towards an improved understanding of proppant flowback in hydraulic fractures,which also supports an optimised proppant size selection for hydraulic fracturing operations.

关键词： Numerical simulation Hydraulic fracturing Proppant flowback Closure stress Particulate flow

3-D Seismic Identification and Characterization of Ancient Channel Morphology

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Journal of Earth Science 2009年第5期20卷 858-867页

作者：蒲仁海朱李钟红利 State key laboratory of continental Dynamics Department of GeologyNorthwest University China national Offshore oil Corporation Limited

It is easy to identify ancient fluvial morphologic types by the outcrop,log and core ***,the horizontal distribution and geometry of the channels can only be identified and predicted by relying on the 3-D seismic *** 3-D seismic horizon slices,especially,can play an important role in the sandstone prediction of meandering rivers,distributary channels and low-sinuosity *** microfacies unit,including main channels,such as sinuous or branching channels,levee,crevasse channels,ligule crevasse splay and floodplain *** be *** channel sandstones are planar tabular lateral-connected sandbodies and the distribution of thick main channel belts can only be identified from 3-D seismic *** the braided sandstones are ubiquitous,their occurrence and distribution do not need to be ***,the coal velocity is so low that it can create a strong amplitude reflection in coal *** consequently conceals the amplitude respondence to anastomosing channel sandstone which could be identified from 3-D seismic inversion data *** studies of mud-rich low-sinuosity rivers identified with 3-D seismic data indicate that the scales and width-to-thickness ratio of such sandbodies are small,laterally unconnected,and generally occurred on distant or further parts of an alluvial fan under dry climate *** extraction of seismic attributes of every reflection event along horizons is expected to maximize expression of the spatial evolutions of ancient channels.

关键词： sandbody identification morphologic river type 3-D seismic explanation low-sinuositychannel.

Influences of Tibetan Plateau uplift on provenance evolution of the paleo-Pearl River

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Chinese Journal Of Geochemistry 2015年第2期34卷 208-218页

作者： Ye Yu Changmin Zhang Shaohua Li Rui Zhu Jiangyan Liu Chenggang Qin Zhongtao Zhang Hunan Provincial key laboratory of shale Gas Resource Utilization Hunan University of Science and Technology MOE key laboratory of Exploration Technologies for oil and Gas Resource Yangtze University Shenzhen Branch of China national Offshore oil Corporation

A comparative analysis of the geochemical characteristics of sediments from the Oligocene Zhuhai Formation(32-23.8 Ma),the Miocene Zhujiang Formation(23.8-16.5 Ma),and the Hanjiang Formation(16.5—10.5 Ma) and a comprehensive analysis of the geochemical characteristics of rocks surrounding the paleo-Pearl River drainage contribute to understanding the influences of the Tibetan Plateau uplift on provenance evolution of the paleo-Pearl *** results show that the geochemical characteristics of sediments from the Oligocene Zhuhai Formation are very different from the geochemical characteristics of sediments from the Miocene Zhujiang and Hanjiang *** ∑ rare earth elements(REE) of mudstone is relatively high in the Zhuhai Formation,204.07-293.88 ppm(average 240.46 ppm),and low in the Zhujiang and Hanjiang Formations,181.32-236.73 ppm(average 203.83 ppm) and 166.84-236.65 ppm(average199.04 ppm),*** chemical index of alteration(CIA) for these samples has a similar trend to the∑ REE:the CIA of the Zhuhai Formation is relatively high and the CIA of the Zhujiang and Hanjiang Formations is relatively *** uplift of the Tibetan Plateau is crucial to the westward expansion of the paleo-Pearl River drainage.

关键词：青藏高原隆升珠江源岩石地球化学特征演变珠江流域稀土元素 PPM 珠海组

Intelligent prediction and integral analysis of shale oil and gas sweet spots

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Petroleum Science 2018年第4期15卷 744-755页

作者： Ke-Ran Qian Zhi-Liang He Xi-Wu Liu Ye-Quan Chen State key laboratory of shale oil and Gas Enrichment Mechanisms and Effective Development Beijing 100083China key laboratory of shale oil and Gas Exploration &Production SINOPECBeijing 100083China Sinopec Petroleum Exploration and Production Research Institute Beijing 100083China

shale reservoirs are characterized by low porosity and strong anisotropy. Conventional geophysical methods are far from perfect when it comes to the prediction of shale sweet spot locations, and even less reliable when attempting to delineate unconventional features of shale oil and gas. Based on some mathematical algorithms such as fuzzy mathematics, machine learning and multiple regression analysis, an effective workflow is proposed to allow intelligent prediction of sweet spots and comprehensive quantitative characterization of shale oil and gas reservoirs. This workflow can effectively combine multi-scale and multi-disciplinary data such as geology, well drilling, logging and seismic data. Following the maximum subordination and attribute optimization principle, we establish a machine learning model by adopting the support vector machine method to arrive at multi-attribute prediction of reservoir sweet spot location. Additionally, multiple regression analysis technology is applied to quantitatively predict a number of sweet spot attributes. The practical application of these methods to areas of interest shows high accuracy of sweet spot prediction, indicating that it is a good approach for describing the distribution of high-quality regions within shale reservoirs. Based on these sweet spot attributes, quantitative characterization of unconventional reservoirs can provide a reliable evaluation of shale reservoir potential.

关键词： shale reservoir Machine learning Support vector machine Sweet spot prediction

Horizontal Well Interference Performance and Water Injection Huff and Puff Effect on Well Groups with Complex Fracture Networks:A Numerical Study

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Computer Modeling in Engineering & Sciences 2023年第12期137卷 2285-2309页

作者： Haoyu Fu Hua Liu Xiaohu Hu Lei Wang State key laboratory of shale oil and Gas EnrichmentMechanisms and Effective Development SINOPECBeijing100101China Sinopec key laboratory of shale oil/Gas Exploration and Production Technology SINOPECBeijing100083China key laboratory of Tectonics and Petroleum Resources Ministry of EducationChina University of GeosciencesWuhan430074China

Well interference has become a common phenomenon with the increasing scale of horizontal well *** studies on well interference in horizontal wells do not properly reflect the physical model of the postfracturing well groups and the realistic fracturing process of infill *** the correspondence between well interference causative factors and manifestations is of great significance for infill well deployment and secondary oil *** this work,we develop a numerical model that considers low velocity non-Darcy seepage inshale reservoirs to study the inter-well interferencephenomenon that occurs in theSantanghufield,andconstruct an explicit hydraulic fracture and complex natural fracture network model with an embedded discrete fracture model,focusing on the effect of fracture network morphology on well *** model also considers a multi-segment wellbore model to accommodate the effect of inter-well crossflow on wellbore tubular *** changes in formation pressure and water saturation during fracturing are performed by controlling the injection pressure and water injection *** result shows that the shape of the fracture network generated by the infill well with the old well determines the subsequent fluid and oil-increasing performance of the disturbed *** synergistic production or competitive relationship formed by fractures with different connectivity between the two wells determines the positive and negative effects of the *** paper also investigates the adaptation study of water injection huff and puff schemes for well groups with different connectivity,and demonstrated a potential yield increase of up to 10.85%under adaptation *** method of identifying well interference based on the production dynamics of affected wells and the subsequent corresponding water injection method provides valuable references for the selection of secondary oil recovery measures.

关键词： Unconventional reservoirs well interference embedded discrete fracture model water injection huff and puff complex fracture networks

Pre-stack seismic density inversion in marine shale reservoirs in the southern Jiaoshiba area, Sichuan Basin, China

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Petroleum Science 2018年第3期15卷 484-497页

作者： Yuan-Yin Zhang Zhi-Jun Jin Ye-Quan Chen Xi-Wu Liu Lei Han Wu-Jun Jin oil and Gas Survey China Geological Survey Beijing 100083 China State key laboratory of shale oil and Gas Enrichment Mechanisms and Effective Development Beijing 100083 China State Energy Center for shale oil Research and Development Beijing 100083 China Sinopec key laboratory of shale oil/Gas Exploration and Production Technology Beijing 100083 China Petroleum Exploration and Production Research Institute Sinopec Beijing 100083 China

For a typical marine shale reservoir in the Jiaoshiba area, Sichuan Basin of China, P-impedance is sensitive for identifying lithology but not suitable for indicating good shale reservoirs. In comparison, density is an important quantity, which is sensitive for identifying the organic-rich mud shale from non-organic-rich mud shale. Due to the poor data quality and incidence angle range, density cannot be easily inverted by directly solving the ill-posed pre-stack seismic inversion in this area. Meanwhile, the traditional density regularizations implemented by directly using the more robust P-impedance inversion tend to be inaccurate for recovering density for this shale reservoir. In this paper, we combine the P-impedance and the minus uranium to construct the pseudo-P-impedance（PIp） at well locations. The PIp is observed to be sensitive for identifying organic-rich mud shale and has a good correlation with density in this area. We employ the PIp–density relation into the pre-stack inversion framework to estimate density. Three types of regularization are tested on both numerical and field data： These are no regularization, traditional regularization and the proposed approach. It is observed that the proposed method is better for recovering the density of organic-rich mud shale in the Jiaoshiba area.

关键词： Density inversion Pseudo-P-impedance Pure P-wave data Regularization

Genetic causes of oil-rich and oil-poor reservoirs: Implications from two Cenozoic basins in the eastern North China Craton

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Science China Earth Sciences 2018年第12期61卷 1910-1931页

作者： Chiyang LIU Lei HUANG Dongdong ZHANG Junfeng ZHAO Yu DENG Pei GUO Yijian HUANG &Jianqiang WANG State key laboratory of continental Dynamics &Institute of oil and Gas Basin Northwest UniversityXi'an 710069China

The Bohai Bay and Hehuai(southern North China) rift basins in the eastern part of the North China Craton are southnorth-adjacent. They have shown synchronous evolutionary processes, and possess generally identical superficial and shallow structural characteristics as well as similar basin areas. However, there is a large difference in the richness of oil resources between the two basins. The Bohai Bay Basin has extremely abundant oil reserves, while commercial oil reserves have not been found in the Hehuai Basin. The deep tectonic structures, magmatic activities, and modern and paleo-geothermal fields of the two basins are significantly different. Compared with the Hehuai Basin, the Bohai Bay Basin has a thinner crust and more complex structure with multiple low-velocity layers. It is also characterized by intense magmatic activity, high modern and paleogeothermal fields, frequent seismic activity, and active deep interactions, small effective elastic thickness of the isotropic lithosphere, and shorter balanced transformation wavelength of the lithosphere with a high likelihood of local compensation. The Hehuai Basin has a simple deep structure and homogeneous crustal composition, with a high likelihood of regional compensation. The characteristics of the deep structures mentioned above are generally similar to those of the southern part of the stable Ordos Basin, except for the smaller crust thickness. This indicates the presence of differences in Mesozoic destruction between the southern and northern zones in the eastern part of the North China Craton. The northern zone was subjected to significant destruction, while the southern zone was subjected to modifications, primarily in the form of local changes in the structures and/or properties of the crust or lithospheric mantle, with the overall structure and stability of the craton kept intact. The formation of high-quality source rock is primarily influenced by the abnormal flourishment of organisms in water bodies

关键词： Genetic causes of oil-rich and oil-poor reservoirs Bohai Bay Basin Hehuai Basin Destruction of North China Craton Deep processes High-quality source rock formation